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Lee, Sin Min
On a simple one-element extension of left zero semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 21 (1980), issue 2, pp. 313-318
MSC: 08A05, 08A30, 08A35, 08B15, 20L05, 20M07, 20M99 | MR 580686 | Zbl 0437.08005
References:
[1] G. BIRKHOFF: Lattice theory. Amer. Math. Soc. Colloq. Publ. No. 25, 3rd Edition (Providence, 1967). MR 0227053 | Zbl 0153.02501
[2] A. H. CLIFFORD G. B. PRESTON: The algebraic theory of semigroups. vol. 1, Amer. Math. Soc., Providence, 1962.
[3] LEE SIN-MIN: On a simple one-element extension of countable and finite n-groupoids. (to appear).
[4] LEE SIN-MIN, SEIN-AYE: On simple groupoids. Nanta Math. 8 (1975), 30-33. MR 0417317
[5] W. TAYLOR: Residually small varieties. Algebra Universalis 2 (1972), 33-53. MR 0314726 | Zbl 0263.08005
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